Added the skit_stream_get_peak function.
socket_fd->listener_fd in tcp_stream; so that the naming is less misleading.
Make it possible to alter the response in slice assertions/enforces when a test fails.
Bugfix: forgot to initialize the indent peak member of ind_stream.  Fixed.
This looks like a bug and might be responsible for init failures.

Sorry, no unittest.  They are desirable, but there is no time
to write one for this right now.
Integer assertions now allow user-defined responses.

Additionally:
sASSERT_(EQ|NE|LE|GE|LT|GT) no longer requires a format parameter.
survival_kit/portable_ints.h now exists.